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J. L TRACY AND L. H. MORSE.

CARBURETOR. APPLICATIONl FILED IUNE 30 I9|6 BENEVIED APR 8| 19l8.

1;435,947, Patented Nov. 21, 1922.

2 SHEETS-SHEET l.

Kwok/Vey@ J. J. TRACY AND L. -H. MORSE.

CARBURETOR. APPLICATION FILED JUNE 30. 1916. RENEWED APR. 8, 1918.

1,435,947, PawndNov. 21,1922.

2 SHEETS--SHEET 2.

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l #T7-@ENE wconstruction the member head 2l on said .'.rneinberu thebeing` such that upon rotating 16 so as to slightly loosen the same inthe casing, said sleeve 20 may be rotated and lett in any desiredangular position with respect to said casing.

Surrounding the duct l0 and the upper end oll the nozzle ll so as to befreely slidable thereon a tubular member or sleeve 253 constituting; inefliect an annular valve which rves to partially close the annular space.activ-een the duct andthe surro'unding` casiviill. This valve isadapted to be raised. Yfrom the normal posit-ion. in which it shown inlull lines in Figure l, to the posi.- tion indica-ted in dotted outline,or any intermediate position by means ot a. rocker mounted in thehorizontal portion ot the casino' end connected te said valve by a linkQT.

Fitted vvithin the upper portion of the casinga so to be freely slidabletherein, is a second tubular member or sleeve 30, the lower end ot Whichconstitutes in etlect :i second annular valve that, in the normalposition of suid member7 .illustraI "'l in sait` lliofure l, surroundssaid first .ned auuular valve and substantnilly completely shuts ellcommunication between the uiper and lower portions oi the casing. il.pirdetcrn'uned vert-ical movement ol this last named valve, however.will leave an annular opening' as will be obvious. the size ol suchoiiening` increasingrg' as the valve continues such upward moveme it.,vvhilu the point at which the opening lirst occurs do pends upon thesetting' oit the lirst named annular valve. il shoulder 3l on the outerWall ot the valve acts to reduce the space within an annular chamberlett between such wall and the adjacent inner "-.vall ot the casiugnupon upward movement ot the nlve. tlurh chainbc has communication withthlx atmosphere through u lateral opening` 33 (lligni rc E2) controlledby a Weighted plunger lfl. which ijiermits in'low ot air to thechainber. restrains the out'lloiv ot such air, so that the etl'ect is todumpen the increment ot the 'valve 30, preventing` any sudden or ecceric action on its part.Y

m screw 9 previously referred to as ing; the abutment, with which theach J Y screw S in the lever 5 contacts.; closes the opening` thatrequires to be provided to permit the valve 34s to be put in place.

`Centrally mounted in the annular airvalve 8O by means ot spideiiarins35 is another valve 36 for controlling` tho opening|`- in thefuel-supply nozzle ll. The body 37 of this valve is coned on its underside to lit the beveled discharge oritice iu such nozzle, and is furtherprovided with a relatively adjustable spindle or needle-valve entensiofn38 threaded in said body and.

adapted to project ivithin the bore l5 ot the nozzle. This extension istapered lgradually troni one end to the other save tor a shortcylindrical section 259 irninediateljfY .diiiceut the coned valvcbody,such cylindrical section boing adapted to lit the aforesaid llore toentirely shut olli the l'loiv oivr .Vuol therethrough until the valvebody has been raised it slight predetermined distance,

' llheacu pon the tapering` portion oli the valve :f

but is verti 1.." reciprocable relativelyY the* o, being;` normallyheld. n depressed posnion by means ol a compression spring` Lll)interposed betivien. the valve head and such spider, Furthermore, thevalve is loosely Lcd at its upper cud in suoli so as to have a certain.amount of lateral. ploy, welL and thus allow it to propitsel'l" in thenozzle. operation. assumingv the position ot the to be as yillustratedin Figure l, with c annular valve occupying` either the posishown. or aslightly raised position, 1.civending` upon the setting` ot therr'icltcu" 2li, il' will be observed. that at the same time the airvalve BO closes communication through e singt, the fuel-valve 3G iscsused to seat in the nozzle so as to shut oli the supply ot tue-l.rl.`he weighted valve 17 in the loivcr cud ot' the l'uel siu'iply ductVl0 ivill lilfoivisc be seated vin this condition ot2 the device, theoli such valve being?r ranged to slightly exceed the pressure ou lli-wtool vline Whether such AFuel be supplied by a gravity leed system. orfrom a tank ui der pressure.

lt snould be ciplai. ed` that no lloat chainn :er is reunir', with thedevice., iuel being ed directly ironi said gravity or nfcssure chamberto the duct by means of the conn ections previously described.

llpon starting the en ine7 the suction, as regulated'by the throttlevalve fr, -vill iininediately litt the air-valve and thus the fuel-valve36, so as respectively to open the annular air passage and litt suchFuel valve sufficiently to open the discharge orilice in the nozzle. Theel'lect ot the suction.. thus admitted to the interior ot the duct 10.rWill be to overcome the Weight oi the vulve plunger li', nearly balancedes it is by the pressure oit the fuel., and so permit the fuel. to liovvfreely past the saine, and, in regulated amount7 past the fuel-valveproper. This amount will obviously increase, as said fuel valve israised higher and higher With an lli lOli

llO

increase in the suction effect of the engine. The air-valve of course islikewise lifted higher and higher, admitting a correspondingly largerand larger amount of air, so as at all times to provide air and fuel inproperV proportions. The air or suction,a`ctua.ted valve, it will benoted, has its lower face, viz, the one that co-operates with theannular valve, 25, beveled, whereby the proper pro portions of air andfuel just referred to are maintained, since areas of the openings forpassage of fuel and air are varied in predetermined fashion uponmovement of said air-valve. The fuel as it escapes from 'the nozzlespread by the action of the conical. face of the fuel-valve into thepath of the air current around the nozzle, and thus a very thorough andintimate mixture of the two ingredients of the charge is secured, Moreexactly, the fuel flows over the surface of the flat upper surface ofthe valve 25, which, whatever its adjusted position, constitutes ineffect` a continuation of the nozzle for the purpose underconsideration. The thin film of liquid vaporizes directly, of course,but, more especially, as it reaches the edge of the fiat circularsurface in question, the air, here moving at its greatest velocity,whips off `as it were the overflowing liquid into minute particles orspray, which quickly vaporizes in such air current as it passes beyond.

It will be observed that the clear area of the passage in which the airvalve 30 oper` ates, is relatively fixed with respect to the clear areaof the discharge opening in which the throttle valve l is located, thearea of such last namedopening being just a. trifle larger than that inconnection with such valve 30.

The modifications in construction shown in Figures 6 and 7, relateprimarily to the form of the annular air valve 41, the body of the valveproper being considerably shorter than in the case of the correspondingvalve 30 of the first described construction. The central portion 42 ofthe spider 41?), however, in which the supplemental valve lo is mounted,is considerably larger in diameter than in said first described.construc tion, and operates as a piston in a cylindrical chamber ed:centrally disposed in tie upper portion of the casing l, being thereheld by means of radial arms Ii5, as clearly shown in Figure 6.

This chamber acts as a dash pot to dampen the movement of the valve injust the same Way as does the annular chamber 32, with the differencethat a larger cross-sectional area is obtainable without restricting thepassage for the gaseous mixture. A steadier action on the part of thevalve results, and it is also easier and simpler to fit the partstogether.

The fuel valve 36 is designed to be mounted in the spider in the same'fashion as before, so as to be capable of a slight relative movementaxially thereof, being held normally in depressed position by means of acompression spring fiO, just as before. nasmuch as the valve ispreferably loosely fitted in the spider center for the reason previouslydescribed, the upper portion of the recess i6 in which the nut 47 thatsecures the valve in place is located, is sealed by means of a threadedplate 4S so that air can be admitted to and exhausted from the chamber4A- only through the restricted. passage or vent i9 provided for thispurpose.

Rotation of the shaft 5 which carries the butterfly valve l is limitedin the fashion as previously, by means of a lever 50 which engages atone end 5l directly with an abutment 53 on the side of the casing andcarries at its other end a set-screw 52 adapted to contact with anabutment on the side of the easing.

It will be noted that asv shown in Figure l, a slight space is leftbetween the two an` nular valves 25 and 30, sufficient to allow a smallvolume of air to be drawn through, even before said valve 8O isperceptibly raised. This is necessary in order to draw the gasoline tlrough the nozzle and provide the initial charge for the engine onstarting. Instead of providing for this minimum draft of air in thisfashion, or in supplement thereof, the further modification illustratedin Figure 6 may be utilized, consisting in the enlargement of the upperport-ion of the bore of said valve 25, which surrounds the fuelsupplyduct and nozzle, so as to leave an annular space 54 which is connectedby means of a series of apertures 55 with the lower portion of thecasing.

The effect of the suction of the engine, as it is rotated in starting,will accordingly be to draw air through these apertures and such annularspace immediately surrounding the nozzle, and thus even more e'ectivelythan before apply such suction to the drawing of the fuel through thenozzle. his arrangement will be more especially desirable in connectionwith large-size carburetors. It will be obvious that the ,general modeof operation of the modified construction of the device, including theaction of the dash-pot, will be the same as that of the form shown inFigures l to 5 inclusive. Despite the central location of such dashspot,the duct 419 leading from the cylinder l0 opens, it will be observed,into the atmosphere, and thus pre vents the engine suction fromproducing a variable effect in the operation of the dashpot by varyingthe pressure in the cylinder, this remaining always at atmospheric.

In both forms of our invention, it will be observed that the adjustmentin position of valve 25 does not affect the normal position of thesurrounding valve 30 or 4l, as the case ln other words, said valve 25may be raised without rc singv the snrrounding which co-operatestl'iere'.vith to close tie annular space between tie .noz zle and thecasing` wall, and witlou as a consequence, raising the fuel-control.valve CSG, lependinel, however, upon the settingu of' said valve 257 tie surronnding` valve will require to be raised greater or lessdistance. by the suction betore air can pass to mix with the 'fuel fromthe nozzle. ts a result7 it will be seen that when a rich mixture isdesired., as on starting' the engine, this result automatically lfollowsthe raising oil'Y said valve 25 through operation ot rocher Thiscapacity ior wholly independ ,1. movement oit' thc valves in questiornwhich may a so be characterized as capacity for movement throughapproximately the same range ot travel, is believed to be unique in thepresent device.; both in construction and in the operative effectthereby secured. The construction in question. takes on particularsignificance where9 as in the several carburetors illustrated. in thedrawings, no float-control for the fuel supply is provided.. ln suchcase, it the adjustment et valve 25 involved the raising?,` ot theneedlevalve, the carburetor would be flooded with disastrous results.

l e therefore particularly point out and distinctly claim as ourinvention :H

l. ln a device oit the character described. the combination of' tubularcasino; having` an air .inlet opening; a fuel nozzle discharging' withinsaid casing; two valves cooperatto substantially close the passagethrough said casing; external operating' means for one oit said valves,the other being` adapted to be moved by the suction of the engine; and athird valve7 operated by said suetion-actuated valve, 'for controllingthe supply of tuel through said nozzle, said `first-named two valvesbeinggj movable independently ot each other, whereby adjustment ot saidexternally operated valve does not atleet the normal position ot said.suc tion-operated valve nor of said 'fuel-control valve.

2. In a device of the character described, the combination of a tubularcasing; having an opening constituting the sole air inlet for thedevice; a fuel nozzle rising` centrally within said casing; twovertically reciprocable annular valves fitting one within the other andco-operating` to substantially close the space between said nozzle andthe casing wall.; external opeiatingl means for one ot' said valves7 theother being adapted to be raised by the suction of the engine; and athird valve7 operated by said suctiim-aetuated valve for controlling thesupply ot fuel through said nozzle, said two annular valves beingreciprocable independently of each other, vr iereby adjustment oli saidenternally operated valve does not atleet-thc normal position of saidsuction-operated valve nor ot said 'fuel-control valve.

In a device ol the character described, the combination of a tubularcasina` having; an air inlet opening; a tnel nozzle rising;F centrallywithin said casing; an annular valve reeiprocable vertically of saidnozzle; external operating` means adapted to position said valve wheredesired; second annular vertically reciprocable valve surround ing saidfirst valve and adapted in 2o-operav tion therewith to substantiallyclose the space between said nozzle and the casing wall; a third valveoperated by said second annular valve for controlling the supply of tuelthrough said nozzle, said two annularx valves being` reciprocableindependently oit each other, whereby adjustment ot said cxternallyoperated valve does not ailiect the normal position of saidsuction-operated valve nor of said fuel-control valve; a cenpistoncarried by said second annular valveg and a cylinder having a ductcommunicating;` with the atmosphere, supported in said casing` inposition to receive said piston and form therewith dash-pot adapted todampen the movement of said second annular valve. Y

4i. ln a device of the character described, the combination of asuitable casing having an outlet tor the charge and an air-inlet; afuel-nozzle rising centrally and discharging within said casing; anexternally adjustable annular valve surroundingsaid nozzle and formedand arranged to receive the fuel as it escapes from said nozzle and todischarge the same radially into the space between said valve andcasing; and a. second. annular valve adapted to surround said lirstvalve and in co-operation therewith to con strict or close theair-passage through said casing adjacent such point of discharge.

Signed by us, this 27th day oil". June, 1916.

Jell/lit ."lllAC/Y. LrlllllljllilCE ll MORSE. Attested by JNO. OBERLTN,D. T. Davms.

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